Hello, I was having a similar problem with a report in Access 2013. Records that had the same data in the same fields showed only the first instance of the data in print preview, but not the following instances. Whereas in the Report view, all the data was showing, even if the same data was repeated across multiple records.
Try this:
1. Open the report in design view.
2. Open the properties for the specific field with the issue.
3. On the Format tab, change Hide Duplicates to "No"
This has the negative consequence of repeating data that has multiple sub data, too, but it might be worth it for clarity. Hope this helps!
Emily